Honeywell RRTH9590WF Quick Start Manual page 4

1.2 Remove old thermostat
faceplate and leave wires
connected
1.2a Take a picture of the wire
connections for later
reference.
1.2b If no wire is connected to a
terminal labeled C or no C
terminal exists on the old
thermostat, view the
Alternate Wiring videos at
wifithermostat.com/videos
Important! C wire is required
and is the power source for your
thermostat. Without a C wire, your
thermostat will not power up.
Note:
picture of your wire
connections to wire the
new thermostat.
C
Terminal
designation
If you have an older thermostat with a
sealed mercury tube, see warning page
for proper disposal instructions.
4
firealarmresources.com
You will need a
M33823A